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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Clutch issue
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<blockquote data-quote="Martyn Goodwin" data-source="post: 45572" data-attributes="member: 2433"><p>I had the same problem woth my Comet - I am using a Magneto. There are a few things to try. First up a liberal spray of WD-40 into/over the ADT mech just in case there is any old gummy oil on its pivots then give it a good workout by hand operating it full travel a few times. Next you need to go to the other end - the points within the magneto and make sure they also operate well in respect to the points cam. In a magneto you will have a ring cam and again WD-40 should be used to clean the rubbing surface and once clean then a small touch of hi temp grease onto the cam surface - I use a "cotton bud" to apply it with my magneto.</p><p></p><p>If you still have issues then you may want to try replacing the ATD springs. There are 3 grades of spring available from the VOC Spares company - Standard, stronger and bloody strong, however before you start playing with the springs it may be useful for you to look at this site </p><p></p><p><a href="http://brightsparkmagnetos.com/faqs/FAQs%20about%20ATDs/How%20critical%20is%20the%20spring%20rate%20and%20preload%20in%20an%20ATD.htm" target="_blank">http://brightsparkmagnetos.com/faqs/FAQs about ATDs/How critical is the spring rate and preload in an ATD.htm</a></p><p></p><p>The VOC Spares Company springs part numbers are:</p><p></p><p>407256 - Velocette heaviest,</p><p>416060 - 500cc AJS/Matchless middle, (BTW These are what I have fitted to my ATD)</p><p>498154 - lightest all others including Vincent, Norton, BSA etc, etc.</p><p></p><p>Here is a link to the VOC Spares Company</p><p></p><p><a href="https://vocspares.mamutweb.com/Account/Logon?ReturnUrl=%2fShop%2fList" target="_blank">https://vocspares.mamutweb.com/Account/Logon?ReturnUrl=/Shop/List</a></p><p></p><p>And finally, from the archives, Big Sid's instruction on changing ATD springs</p><p></p><p><em>" One can often shorten a spring that fits loosely by cutting off the end loop and bending over the next one or the second one if careful . </em><em> With the cover off and the center nut still tight so it's taper is well set you proceed as follows . Carefully back off on the center nut just enough to slip out the horseshoe and tin disc so revealing the springs . Go easy not to back off the inner removal mechanism . </em></p><p><em> Change the springs , now accessible , be sure they tug on the peg , not hang loose , trim off the end loop and reform if needed . </em></p><p><em> Tuck in a piece of cloth below in the opening to prevent dropping in the spring ! Remove the cloth . Replace the tin disc and the horseshoe washer . If this is bent up , often is , flatten it first . Re tighten the center bolt holding all in position carefully . </em></p><p><em> Replace the cover . All done . Good luck . Sid . "</em></p><p></p><p>Hope this is of some help</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 45572, member: 2433"] I had the same problem woth my Comet - I am using a Magneto. There are a few things to try. First up a liberal spray of WD-40 into/over the ADT mech just in case there is any old gummy oil on its pivots then give it a good workout by hand operating it full travel a few times. Next you need to go to the other end - the points within the magneto and make sure they also operate well in respect to the points cam. In a magneto you will have a ring cam and again WD-40 should be used to clean the rubbing surface and once clean then a small touch of hi temp grease onto the cam surface - I use a "cotton bud" to apply it with my magneto. If you still have issues then you may want to try replacing the ATD springs. There are 3 grades of spring available from the VOC Spares company - Standard, stronger and bloody strong, however before you start playing with the springs it may be useful for you to look at this site [url]http://brightsparkmagnetos.com/faqs/FAQs%20about%20ATDs/How%20critical%20is%20the%20spring%20rate%20and%20preload%20in%20an%20ATD.htm[/url] The VOC Spares Company springs part numbers are: 407256 - Velocette heaviest, 416060 - 500cc AJS/Matchless middle, (BTW These are what I have fitted to my ATD) 498154 - lightest all others including Vincent, Norton, BSA etc, etc. Here is a link to the VOC Spares Company [url]https://vocspares.mamutweb.com/Account/Logon?ReturnUrl=%2fShop%2fList[/url] And finally, from the archives, Big Sid's instruction on changing ATD springs [I]" One can often shorten a spring that fits loosely by cutting off the end loop and bending over the next one or the second one if careful . [/I][I] With the cover off and the center nut still tight so it's taper is well set you proceed as follows . Carefully back off on the center nut just enough to slip out the horseshoe and tin disc so revealing the springs . Go easy not to back off the inner removal mechanism . [/I] [I] Change the springs , now accessible , be sure they tug on the peg , not hang loose , trim off the end loop and reform if needed . [/I] [I] Tuck in a piece of cloth below in the opening to prevent dropping in the spring ! Remove the cloth . Replace the tin disc and the horseshoe washer . If this is bent up , often is , flatten it first . Re tighten the center bolt holding all in position carefully . [/I] [I] Replace the cover . All done . Good luck . Sid . "[/I] Hope this is of some help Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Clutch issue
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